EP 0274743 A3 19890726 - BISCHLOROFORMATE PREPARATION METHOD WITH PHOSGENE REMOVAL AND MONOCHLOROFORMATE CONVERSION
Title (en)
BISCHLOROFORMATE PREPARATION METHOD WITH PHOSGENE REMOVAL AND MONOCHLOROFORMATE CONVERSION
Publication
Application
Priority
US 438687 A 19870116
Abstract (en)
[origin: EP0274743A2] Aqueous bischloroformates are prepared by the reaction of a dihydroxyaromatic compound (e.g., bisphenol A) with phosgene in a substantially inert organic liquid (e.g., methylene chloride) and in the presence of an aqueous alkali metal or alkaline earth metal base, at a pH below about 8. After all solid dihydroxyaromatic compound has been consumed, the pH is raised to a value in che range of about 7-12, preferably 9-11, and maintained in said range until a major proportion of the unreacted phosgene has been hydrolyzed. At the same time, any monochloroformate in the product may be converted to bischloroformate.
IPC 1-7
IPC 8 full level
C07C 68/02 (2006.01); C07C 69/96 (2006.01)
CPC (source: EP)
C07C 68/02 (2013.01); C07C 69/96 (2013.01)
Citation (search report)
[AD] WO 8603192 A1 19860605 - GEN ELECTRIC [US]
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0274743 A2 19880720; EP 0274743 A3 19890726; JP S63215654 A 19880908
DOCDB simple family (application)
EP 87119245 A 19871228; JP 504288 A 19880114